Improvement in sectional steam-generators



UNITED JSTATEs PATENT OFFICE.

DAVID RENSHAW, OF PHILADELPHIA, PENNSYLVANIA.

IMPRovEMvENT IN sEc'rloNAL sTEAMeENERAToRs- Specification forming part of Letters Patent No. `143,845, dated October -21, 1873; application filed February 4, 1873. Y

To all whom 'it may concern.'

Be it known that I, DAVID RENSHAW, of Philadelphia, in. the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in, Sectional Steam-Generators; and I do hereby declare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which it pertains to make and use it,reference being had to the accompanying drawings, which form part of erators; and consists `in the construction and arrangement of parts, as hereinafter described.

The furnace employed is constructed, generally, according to my patent of February 20, l872-that is to say, it is a reverberatory furnace with an arched or rounded top or crown; it is made in `sections which are cast hollow, s'o as to serve as receptacles for water, and to generate steam, and secured by stay-bolts cast with the sections, these sections being bolted to each other and communicating with a steamdrum located above the furnace. In the patent referred to these sections thus formed rise from a base or water chamber made of cast metal, said base being considerably wider than the sections which it supports. i

` In the present case I substitute for the broad base a dat section or sections, of the same width as those which form the crown of the furnace, and communicating therewith by dan ged open projections, as shown in my patent of December 24, 1.872, No. 134,165. These basesections are cast with stay-bolts, in the same manner as the upper sections, and are arranged around the four sides of the furnace, having suitable bends at the corners, and being curved or arched at the front to formthe door-frame.

This construction of the furnace-base constitutes part of my invention, which consists further in the construction of internal generators,

and in their combination with a reverberatory municate by means of open connections, as

shown at c, consisting of flanged projections, formed with thick walls, so that said upper and lower sections,A at their point of junction, will be dush'with each other. The base eX- ltends around the four sides of the furnace, as l suggested, and the sections'are bolted together by means of anges cast upon them, the front being arched at c for the furnace-door. D D are flues, running parallel with the sides of the furnace, having short upward extensions for carrying off the gases and products of combustion. These iiues pass out at the rear of the furnace, where they turn and imite, forming a single flue, which enters the chimney at a suitable point. E E are cast-n1etal sections, of the form shown, extending from the front to the rear wall of the furnace, and cast with stay-bolts, similar to the sections forming the sides. The ends of these section spass through the front and rear walls of the furnace, and

are provided, as shown, with anges or caps e, by which they are closed. They also communicate with the base by means 'of the curved pipes el, through which they are fed, and with the crown by means of similar pipes e2, through which they discharge their steam. The sections B B communicate with the steam-drum F by means of the projections b cast on said l sections. G is a supply-pipe communicating with the base C; and His a blow-off pipe connected with said base. The grate is shown at I, being of the same length and width as the A inside of the furnace, thereby giving a large resnrface. The side walls ofthe furnace are hollow, as shown, but the front and rear are of hollow sections at the base only, the upper portion being brick, surrounding the ends of the internal sections E, the ends whereof come through the front and rear, as already suggested.

The advantages of a furnace thus constructed are as follows: The base being made in sections of ythe same Width as the upper part or crown7 the area oi' the'grate is considerably extended, and a large increase made to the iiresurface. It also decreases the amount of Water carried to a given amount of grate-snrface, and hence gives a proportionately increased economy in generation. The base-sections are made of the saine Width as the upper sections, width-another important object in View,

berated heat, thereby utilizing` all the available room. These sections are also formed Without a single joint exposed to the action of the re, which is a point of great importance, and are so arranged that they may be taken separately from the furnace with little difficulty or delay.

If desired, each of the crown and base sections may be cast in a single piece, having side and bottom flanges, by which they are secured together. Nlien thus constructed the sections Will communicate by suitable openings near their lower ends.

What I claim is- 1. The base C, constructed of fiat sections, stay-bolted, as set forth, being` of the saine width as the upper part of the furnace, and connected therewith by means of flanged projections, substantially as setiorth.

2. The horizontal internal sections E, con structed as shown, cach section eXtendin g from the front to the yrea of the furnace, and com munieating with the base and upper sections by means of the curved pipes e el, as described.

3. The combination of the base C, upper sec tions B, inner sections E, and drum l, subh Stantially as specied, said base C and section B being` of the same Width and staybolted, and each oi' the sections E extending from the t'ront to the rear of the furnace, as specified.

In testimony that I claim the `foregoing I havehereunto set my hand this 22d day of January, 1875i.

DAVID RENSHAV. Witnesses:

M. DANL. GONNOLLY, Tiros. A. GONNOLLY. 

